/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.zxing.decoding;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;
import com.zxing.CaptureCallback;
import com.zxing.R;
import com.zxing.camera.CameraManager;
import com.zxing.view.ViewfinderResultPointCallback;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import java.util.Vector;

/**
 * This class handles all the messaging which comprises the state machine for capture.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class CaptureActivityHandler extends Handler {

  private static final String TAG = CaptureActivityHandler.class.getSimpleName();

  private CaptureCallback callback;
  private final DecodeThread decodeThread;
  private State state;

  private enum State {
    PREVIEW,
    SUCCESS,
    DONE
  }

  public CaptureActivityHandler(CaptureCallback callback, Vector<BarcodeFormat> decodeFormats,String characterSet) {
    this.callback = callback;
    decodeThread = new DecodeThread(callback, decodeFormats, characterSet,
        new ViewfinderResultPointCallback(callback.getViewfinderView()));
    decodeThread.start();
    state = State.SUCCESS;

    // Start ourselves capturing previews and decoding.
    CameraManager.get().startPreview();
    restartPreviewAndDecode();
  }

  @Override
  public void handleMessage(Message message) {
	  if(message.what == R.id.auto_focus){
		  //Log.d(TAG, "Got auto-focus message");
		  // When one auto focus pass finishes, start another. This is the closest thing to
		  // continuous AF. It does seem to hunt a bit, but I'm not sure what else to do.
		  if (state == State.PREVIEW) {
			  CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
		  }
	  }else if(message.what == R.id.restart_preview){
		  restartPreviewAndDecode();
	  }else if(message.what == R.id.decode_succeeded){
		  Log.d(TAG, "Got decode succeeded message");
	        state = State.SUCCESS;
	        Bundle bundle = message.getData();
	        Bitmap barcode = bundle == null ? null :
	            (Bitmap) bundle.getParcelable(DecodeThread.BARCODE_BITMAP);
	        callback.handleDecode((Result) message.obj, barcode);
	  }else if(message.what == R.id.decode_failed){
		// We're decoding as fast as possible, so when one decode fails, start another.
	        state = State.PREVIEW;
	        CameraManager.get().requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
	        Log.d(TAG, "Got return scan result message");
//	        activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
//	        activity.finish();
	  }else if(message.what == R.id.return_scan_result){
		  Log.d(TAG, "Got return scan result message");
//        activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
//        activity.finish();
	  }else if(message.what ==  R.id.launch_product_query){
		  Log.d(TAG, "Got product query message");
//        String url = (String) message.obj;
//        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
//        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
//        activity.startActivity(intent);
	  }
  }

  public void quitSynchronously() {
    state = State.DONE;
    CameraManager.get().stopPreview();
    Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
    quit.sendToTarget();
    try {
      decodeThread.join();
    } catch (InterruptedException e) {
      // continue
    }

    // Be absolutely sure we don't send any queued up messages
    removeMessages(R.id.decode_succeeded);
    removeMessages(R.id.decode_failed);
  }

  public void restartPreviewAndDecode() {
    if (state == State.SUCCESS) {
      state = State.PREVIEW;
      CameraManager.get().requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
      CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
      callback.drawViewfinder();
    }
  }

}
